Recreate framebuffer objects when opengl context changes

java/libraries/opengl/src/processing/opengl/PFramebuffer.java

@@ -402,6 +402,25 @@ public class PFramebuffer implements PConstants {
   }
   
   
+  protected boolean contextIsOutdated() {
+    boolean outdated = !pgl.contextIsCurrent(context);
+    if (outdated) {
+      glFboID = 0;
+      glDepthBufferID = 0;
+      glStencilBufferID = 0;
+      glDepthStencilBufferID = 0;    
+      glColorBufferMultisampleID = 0;
+      
+      for (int i = 0; i < numColorBuffers; i++) {
+        colorBufferTex[i] = null;
+      }
+     
+      backupTexture = null;            
+    }
+    return outdated;
+  }  
+  
+  
   protected void createColorBufferMultisample() {
     if (screenFb) return;
     

java/libraries/opengl/src/processing/opengl/PGraphicsOpenGL.java

@@ -1376,7 +1376,14 @@ public class PGraphicsOpenGL extends PGraphics {
     } else {
       if (!pgl.initialized) {
         initOffscreen();        
-      }     
+      } else {
+        boolean outdated = offscreenFramebuffer != null && offscreenFramebuffer.contextIsOutdated();
+        boolean outdatedMulti = offscreenFramebufferMultisample != null && offscreenFramebufferMultisample.contextIsOutdated();
+        if (outdated || outdatedMulti) {
+          pgl.initialized = false;
+          initOffscreen();
+        }
+      }
       
       pushFramebuffer();
       if (offscreenMultisample) {
@@ -4851,7 +4858,7 @@ public class PGraphicsOpenGL extends PGraphics {
   
   protected void loadTextureImpl(int sampling) {
     if (width == 0 || height == 0) return;
-    if (texture == null) {
+    if (texture == null || texture.contextIsOutdated()) {
       PTexture.Parameters params = PTexture.newParameters(ARGB, sampling);
       texture = new PTexture(parent, width, height, params);      
       texture.setFlippedY(true);